"Now things are coming out as to how the entire fundamentals were changed for AgustaWestland, (how) the tenders were changed. The Congress party must reply, Madam Sonia Gandhi must reply, Rahul Gandhi must reply," he told reporters here.
Referring to former Defence Minister A K Anthony's remarks that the Modi government should punish the bribe takers if there was evidence, the IT Minister said the agencies were probing the matter.
Prasad asked Sonia "to please explain who were the bribe takers because all the decisions, manipulations in tenders were done when the UPA government was there."
The NDA government was committed to a fair investigation into the matter and bring to book those "who have done this great corruption and brought shame to the country," he said.
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Slammimg Congress and its ally DMK on the 2G scam, Prasad said scams like Coal auction and AgustaWestland "keep tumbling" out with "alarming regularity."
He also sought to 'remind' Congress that the proof in this case "has come in Italy," in an apparent reference to the conviction of Finmeccanica's former chief Giuseppe Orsi to 4.5 years in jail for corruption in the deal relating to sale of 12 VVIP choppers to India.
To a question on Congress leader Jairam Ramesh alleging a
"The larger issue is can Mr Jairam Ramesh point out any impropriety or corruption in our two-year government," he asked.
Asked about his cabinet colleague Piyush Goyal's Tamil Nadu Chief Minister "Jayalalithaa is inaccessible" remark, the Minister said, "I don't think this is a big issue in" the state.
"We as Central Ministers keep visiting the entire country. We may be able to meet Chief Ministers or not but that is not the issue at all. That should not become a political issue at all," he said.
The BJP was fighting both AIADMK and DMK and a 'beacon of hope' among corruption, he claimed.
(REOPENS MDS12)
Addressing an election rally in neighbouring Puducherry, Prasad said there had been scams during the previous UPA rule which included the 2G, coalgate and the helicopter muddle, exposed recently.
"If the giver of bribe in the helicopter (scam) has been convicted, should not those who received the kickbacks be also prosecuted and convicted," he asked.